bfd/mach-o-aarch64.c

   1 /* AArch-64 Mach-O support for BFD.
   2    Copyright (C) 2015-2020 Free Software Foundation, Inc.
   3
   4    This file is part of BFD, the Binary File Descriptor library.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  19    MA 02110-1301, USA.  */
  20
  21 #include "sysdep.h"
  22 #include "bfd.h"
  23 #include "libbfd.h"
  24 #include "libiberty.h"
  25 #include "mach-o.h"
  26 #include "mach-o/arm64.h"
  27
  28 #define bfd_mach_o_object_p bfd_mach_o_arm64_object_p
  29 #define bfd_mach_o_core_p bfd_mach_o_arm64_core_p
  30 #define bfd_mach_o_mkobject bfd_mach_o_arm64_mkobject
  31
  32 #define bfd_mach_o_canonicalize_one_reloc \
  33   bfd_mach_o_arm64_canonicalize_one_reloc
  34 #define bfd_mach_o_swap_reloc_out NULL
  35
  36 #define bfd_mach_o_bfd_reloc_type_lookup bfd_mach_o_arm64_bfd_reloc_type_lookup
  37 #define bfd_mach_o_bfd_reloc_name_lookup bfd_mach_o_arm64_bfd_reloc_name_lookup
  38
  39 #define bfd_mach_o_print_thread NULL
  40 #define bfd_mach_o_tgt_seg_table NULL
  41 #define bfd_mach_o_section_type_valid_for_tgt NULL
  42
  43 static bfd_cleanup
  44 bfd_mach_o_arm64_object_p (bfd *abfd)
  45 {
  46   return bfd_mach_o_header_p (abfd, 0, 0, BFD_MACH_O_CPU_TYPE_ARM64);
  47 }
  48
  49 static bfd_cleanup
  50 bfd_mach_o_arm64_core_p (bfd *abfd)
  51 {
  52   return bfd_mach_o_header_p (abfd, 0,
  53                               BFD_MACH_O_MH_CORE, BFD_MACH_O_CPU_TYPE_ARM64);
  54 }
  55
  56 static bfd_boolean
  57 bfd_mach_o_arm64_mkobject (bfd *abfd)
  58 {
  59   bfd_mach_o_data_struct *mdata;
  60
  61   if (!bfd_mach_o_mkobject_init (abfd))
  62     return FALSE;
  63
  64   mdata = bfd_mach_o_get_data (abfd);
  65   mdata->header.magic = BFD_MACH_O_MH_MAGIC;
  66   mdata->header.cputype = BFD_MACH_O_CPU_TYPE_ARM64;
  67   mdata->header.cpusubtype = BFD_MACH_O_CPU_SUBTYPE_ARM64_ALL;
  68   mdata->header.byteorder = BFD_ENDIAN_LITTLE;
  69   mdata->header.version = 1;
  70
  71   return TRUE;
  72 }
  73
  74 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value.  */
  75 #define MINUS_ONE (~ (bfd_vma) 0)
  76
  77 static reloc_howto_type arm64_howto_table[]=
  78 {
  79   /* 0 */
  80   HOWTO (BFD_RELOC_64, 0, 4, 64, FALSE, 0,
  81          complain_overflow_bitfield,
  82          NULL, "64",
  83          FALSE, MINUS_ONE, MINUS_ONE, FALSE),
  84   HOWTO (BFD_RELOC_32, 0, 2, 32, FALSE, 0,
  85          complain_overflow_bitfield,
  86          NULL, "32",
  87          FALSE, 0xffffffff, 0xffffffff, FALSE),
  88   HOWTO (BFD_RELOC_16, 0, 1, 16, FALSE, 0,
  89          complain_overflow_bitfield,
  90          NULL, "16",
  91          FALSE, 0xffff, 0xffff, FALSE),
  92   HOWTO (BFD_RELOC_8, 0, 0, 8, FALSE, 0,
  93          complain_overflow_bitfield,
  94          NULL, "8",
  95          FALSE, 0xff, 0xff, FALSE),
  96   /* 4 */
  97   HOWTO (BFD_RELOC_64_PCREL, 0, 4, 64, TRUE, 0,
  98          complain_overflow_bitfield,
  99          NULL, "DISP64",
 100          FALSE, MINUS_ONE, MINUS_ONE, TRUE),
 101   HOWTO (BFD_RELOC_32_PCREL, 0, 2, 32, TRUE, 0,
 102          complain_overflow_bitfield,
 103          NULL, "DISP32",
 104          FALSE, 0xffffffff, 0xffffffff, TRUE),
 105   HOWTO (BFD_RELOC_16_PCREL, 0, 1, 16, TRUE, 0,
 106          complain_overflow_bitfield,
 107          NULL, "DISP16",
 108          FALSE, 0xffff, 0xffff, TRUE),
 109   HOWTO (BFD_RELOC_AARCH64_CALL26, 0, 2, 26, TRUE, 0,
 110          complain_overflow_bitfield,
 111          NULL, "BRANCH26",
 112          FALSE, 0x03ffffff, 0x03ffffff, TRUE),
 113   /* 8 */
 114   HOWTO (BFD_RELOC_AARCH64_ADR_HI21_PCREL, 12, 2, 21, TRUE, 0,
 115          complain_overflow_signed,
 116          NULL, "PAGE21",
 117          FALSE, 0x1fffff, 0x1fffff, TRUE),
 118   HOWTO (BFD_RELOC_AARCH64_LDST16_LO12, 1, 2, 12, TRUE, 0,
 119          complain_overflow_signed,
 120          NULL, "PGOFF12",
 121          FALSE, 0xffe, 0xffe, TRUE),
 122   HOWTO (BFD_RELOC_MACH_O_ARM64_ADDEND, 0, 2, 32, FALSE, 0,
 123          complain_overflow_signed,
 124          NULL, "ADDEND",
 125          FALSE, 0xffffffff, 0xffffffff, FALSE),
 126   HOWTO (BFD_RELOC_MACH_O_SUBTRACTOR32, 0, 2, 32, FALSE, 0,
 127          complain_overflow_bitfield,
 128          NULL, "SUBTRACTOR32",
 129          FALSE, 0xffffffff, 0xffffffff, FALSE),
 130   /* 12 */
 131   HOWTO (BFD_RELOC_MACH_O_SUBTRACTOR64, 0, 4, 64, FALSE, 0,
 132          complain_overflow_bitfield,
 133          NULL, "SUBTRACTOR64",
 134          FALSE, MINUS_ONE, MINUS_ONE, FALSE),
 135   HOWTO (BFD_RELOC_MACH_O_ARM64_GOT_LOAD_PAGE21, 12, 2, 21, TRUE, 0,
 136          complain_overflow_signed,
 137          NULL, "GOT_LD_PG21",
 138          FALSE, 0x1fffff, 0x1fffff, TRUE),
 139   HOWTO (BFD_RELOC_MACH_O_ARM64_GOT_LOAD_PAGEOFF12, 1, 2, 12, TRUE, 0,
 140          complain_overflow_signed,
 141          NULL, "GOT_LD_PGOFF12",
 142          FALSE, 0xffe, 0xffe, TRUE),
 143   HOWTO (BFD_RELOC_MACH_O_ARM64_POINTER_TO_GOT, 0, 2, 32, TRUE, 0,
 144          complain_overflow_bitfield,
 145          NULL, "PTR_TO_GOT",
 146          FALSE, 0xffffffff, 0xffffffff, TRUE),
 147 };
 148
 149 static bfd_boolean
 150 bfd_mach_o_arm64_canonicalize_one_reloc (bfd *       abfd,
 151                                          struct mach_o_reloc_info_external * raw,
 152                                          arelent *   res,
 153                                          asymbol **  syms,
 154                                          arelent *   res_base ATTRIBUTE_UNUSED)
 155 {
 156   bfd_mach_o_reloc_info reloc;
 157
 158   res->address = bfd_get_32 (abfd, raw->r_address);
 159   if (res->address & BFD_MACH_O_SR_SCATTERED)
 160     {
 161       /* Only non-scattered relocations.  */
 162       return FALSE;
 163     }
 164
 165   /* The value and info fields have to be extracted dependent on target
 166      endian-ness.  */
 167   bfd_mach_o_swap_in_non_scattered_reloc (abfd, &reloc, raw->r_symbolnum);
 168
 169   if (reloc.r_type == BFD_MACH_O_ARM64_RELOC_ADDEND)
 170     {
 171       if (reloc.r_length == 2 && reloc.r_pcrel == 0)
 172         {
 173           res->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
 174           res->addend = reloc.r_value;
 175           res->howto = &arm64_howto_table[10];
 176           return TRUE;
 177         }
 178       return FALSE;
 179     }
 180
 181   if (!bfd_mach_o_canonicalize_non_scattered_reloc (abfd, &reloc, res, syms))
 182     return FALSE;
 183
 184   switch (reloc.r_type)
 185     {
 186     case BFD_MACH_O_ARM64_RELOC_UNSIGNED:
 187       switch ((reloc.r_length << 1) | reloc.r_pcrel)
 188         {
 189         case 0: /* len = 0, pcrel = 0  */
 190           res->howto = &arm64_howto_table[3];
 191           return TRUE;
 192         case 2: /* len = 1, pcrel = 0  */
 193           res->howto = &arm64_howto_table[2];
 194           return TRUE;
 195         case 3: /* len = 1, pcrel = 1  */
 196           res->howto = &arm64_howto_table[6];
 197           return TRUE;
 198         case 4: /* len = 2, pcrel = 0  */
 199           res->howto = &arm64_howto_table[1];
 200           return TRUE;
 201         case 5: /* len = 2, pcrel = 1  */
 202           res->howto = &arm64_howto_table[5];
 203           return TRUE;
 204         case 6: /* len = 3, pcrel = 0  */
 205           res->howto = &arm64_howto_table[0];
 206           return TRUE;
 207         case 7: /* len = 3, pcrel = 1  */
 208           res->howto = &arm64_howto_table[4];
 209           return TRUE;
 210         default:
 211           return FALSE;
 212         }
 213       break;
 214     case BFD_MACH_O_ARM64_RELOC_SUBTRACTOR:
 215       if (reloc.r_pcrel)
 216         return FALSE;
 217       switch (reloc.r_length)
 218         {
 219         case 2:
 220           res->howto = &arm64_howto_table[11];
 221           return TRUE;
 222         case 3:
 223           res->howto = &arm64_howto_table[12];
 224           return TRUE;
 225         default:
 226           return FALSE;
 227         }
 228       break;
 229     case BFD_MACH_O_ARM64_RELOC_BRANCH26:
 230       if (reloc.r_length == 2 && reloc.r_pcrel == 1)
 231         {
 232           res->howto = &arm64_howto_table[7];
 233           return TRUE;
 234         }
 235       break;
 236     case BFD_MACH_O_ARM64_RELOC_PAGE21:
 237       if (reloc.r_length == 2 && reloc.r_pcrel == 1)
 238         {
 239           res->howto = &arm64_howto_table[8];
 240           return TRUE;
 241         }
 242       break;
 243     case BFD_MACH_O_ARM64_RELOC_PAGEOFF12:
 244       if (reloc.r_length == 2 && reloc.r_pcrel == 0)
 245         {
 246           res->howto = &arm64_howto_table[9];
 247           return TRUE;
 248         }
 249       break;
 250     case BFD_MACH_O_ARM64_RELOC_GOT_LOAD_PAGE21:
 251       if (reloc.r_length == 2 && reloc.r_pcrel == 1)
 252         {
 253           res->howto = &arm64_howto_table[13];
 254           return TRUE;
 255         }
 256       break;
 257     case BFD_MACH_O_ARM64_RELOC_GOT_LOAD_PAGEOFF12:
 258       if (reloc.r_length == 2 && reloc.r_pcrel == 0)
 259         {
 260           res->howto = &arm64_howto_table[14];
 261           return TRUE;
 262         }
 263       break;
 264     case BFD_MACH_O_ARM64_RELOC_POINTER_TO_GOT:
 265       if (reloc.r_length == 2 && reloc.r_pcrel == 1)
 266         {
 267           res->howto = &arm64_howto_table[15];
 268           return TRUE;
 269         }
 270       break;
 271     default:
 272       break;
 273     }
 274   return FALSE;
 275 }
 276
 277 static reloc_howto_type *
 278 bfd_mach_o_arm64_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 279                                         bfd_reloc_code_real_type code)
 280 {
 281   unsigned int i;
 282
 283   for (i = 0;
 284        i < sizeof (arm64_howto_table) / sizeof (*arm64_howto_table);
 285        i++)
 286     if (code == arm64_howto_table[i].type)
 287       return &arm64_howto_table[i];
 288   return NULL;
 289 }
 290
 291 static reloc_howto_type *
 292 bfd_mach_o_arm64_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 293                                       const char *name ATTRIBUTE_UNUSED)
 294 {
 295   return NULL;
 296 }
 297
 298 #define TARGET_NAME             aarch64_mach_o_vec
 299 #define TARGET_STRING           "mach-o-arm64"
 300 #define TARGET_ARCHITECTURE     bfd_arch_aarch64
 301 #define TARGET_PAGESIZE         4096
 302 #define TARGET_BIG_ENDIAN       0
 303 #define TARGET_ARCHIVE          0
 304 #define TARGET_PRIORITY         0
 305 #include "mach-o-target.c"
 306
 307 #undef TARGET_NAME
 308 #undef TARGET_STRING
 309 #undef TARGET_ARCHIVE
 310 #undef TARGET_PRIORITY